Scheda di esercizi di Chimica per i test di ammissione a infermieristica con soluzioni

Which method separates sand from water?

1. ADistillation
2. BFiltration
3. CChromatography
4. DEvaporation of the sand

What does the rate of a reaction measure?

1. AHow much energy the final products contain
2. BHow much product forms in total by the end
3. CHow hot the reaction gets
4. DHow quickly reactants are used up or products are formed

In a chemical equation, what does the symbol (aq) after a formula mean?

1. ADissolved in water
2. BA solid
3. CA gas
4. DA pure liquid

A reaction has ΔH = −890 kJ/mol. What does the negative sign tell you?

1. AThe reaction needs a catalyst
2. BThe reaction is endothermic
3. CThe reaction is exothermic
4. DThe reaction is at equilibrium

What is the molar mass of sodium chloride, NaCl (Na = 23, Cl = 35,5 g/mol)?

1. A23 g/mol
2. B81,5 g/mol
3. C58,5 g/mol
4. D12,5 g/mol

Qual è la disposizione elettronica di un atomo di sodio (11 elettroni)?

1. A2, 8, 1
2. B8, 2, 1
3. C2, 8, 2
4. D2, 9

Which substance has the lowest boiling point?

1. ASodium chloride
2. BIron
3. CWater
4. DHelium

Why is incomplete combustion of fuel in a poorly ventilated room dangerous?

1. AIt produces nitrogen, which replaces oxygen in the blood
2. BIt produces water vapour, which is toxic
3. CIt produces carbon monoxide, which binds to haemoglobin and blocks oxygen transport
4. DIt produces extra oxygen, which damages the lining of the lungs over time